DevTools: allow using Storage::Get/SetCookies w/o browser context id.

Change-Id: I81afd25f1124dd18da8e406bb46156ffccfbd616
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1937864
Commit-Queue: Pavel Feldman <pfeldman@chromium.org>
Commit-Queue: Dmitry Gozman <dgozman@chromium.org>
Auto-Submit: Pavel Feldman <pfeldman@chromium.org>
Reviewed-by: Dmitry Gozman <dgozman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#719404}

content/browser/devtools/protocol/storage_handler.cc

@@ -504,13 +504,6 @@ void StorageHandler::NotifyIndexedDBContentChanged(
 Response StorageHandler::FindStoragePartition(
     const Maybe<std::string>& browser_context_id,
     StoragePartition** storage_partition) {
-  if (!browser_context_id.isJust()) {
-    if (!storage_partition_)
-      return Response::InvalidParams("Browser context not specified");
-    *storage_partition = storage_partition_;
-    return Response::OK();
-  }
-
   BrowserContext* browser_context = nullptr;
   Response response =
       BrowserHandler::FindBrowserContext(browser_context_id, &browser_context);